What preventive measure should Tia share with public officials in her community that effectively targets her goal to prevent the spread of giardia?

Giardia can spread when people swallow water contaminated with the parasite, including water in poorly monitored public pools. Testing city pools more frequently can help officials detect contamination and take action before more people are exposed. Researching the parasite or identifying symptoms may provide information, but those steps do not directly prevent its spread.

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